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Job Class

Enhanced Definition

A categorization assigned to jobs for scheduling and resource allocation purposes. Job classes enable workload management by grouping similar jobs together. A Job Class is a single-character (A-Z, 0-9) scheduling category assigned to a batch job in a z/OS system. It defines a set of execution characteristics and resource limits, controlling how the Job Entry Subsystem (JES) processes the job, including its priority, resource allocation, and which initiators can select it for execution.

Key Characteristics

- Letter (A-Z) or number (0-9) designation
- Controls job selection
- Influences scheduling priority
- Determines initiator assignment
- Groups similar workload
Class Usage:
- Production: Critical business processing
- Development: Application testing
- Long-running: High resource consumers
- Short jobs: Quick turnaround
- Special requirements: Specific resources needed
Class Assignment Factors:
- Job duration estimate
- Resource requirements
- Business priority
- Time of day restrictions
- Service level objectives
Initiator Configuration:
- Initiators assigned to classes
- Multiple classes per initiator
- Class-based priority
- Dynamic class changes

Use Cases

- Separating production and test work
- Managing long-running jobs
- Implementing business priorities
- Controlling system resource usage
- Scheduling by time of day